Pianoforte-action.



No. 763,910. PATENTED JUNE 28, 1904. P. KRUMSOHEID.

PIANOFORTE ACTION.

APPLIUATION FILED DB0. 1. 1903. No Holm..

Patented June 28, 1904.

UNITED STATES PATENT OFFICE.

PETER KRUMSOHEID, OF BOSTON, MASSACHUSETTS.

PIANOFORTE-ACTION.

SPECIFICATION forming part Letters Patent No. 763,910, dated June 28, 1904.

Application tiled December l, 1903. Serial No. 183,405. (No model.)

To all whom, t muy concern:

Be it known that I, PETER KRUMSCHEID, a citizen of the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Pianoforte-Actions, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to the parts of a pianoforte that support the action, for convenience these parts being termed the brackets; and it consists in the peculiar manner in which the upper ends of the brackets are constructed and also in the forming of the screw-bolts that connect the upper ends of the bracket to the pin-block.

The object is to make a simple and cheap device by which the action may be .readily attached and detached. This object I attain by means of the construction shown in the accompanying drawings, in which- Figure 1 is an elevation of one of the brackets, the lower part being omitted. Fig. 2 is a vertical section showing the upper end of the bracket and a part of the screw-bolt that connects to the pin-block.

In the drawings, A Al A2 represent the bracket, to the middle part of which the hammer-rail B is attached. The lower end of the bracket (not shown) is attached to the frame of the pianoforte in the usual manner.

I will now describe the parts that I consider new and of my invention.

The upper end of the bracket has a recess at C, which receives the coned end D of the screw-bolt E F. The bolt is fiatted, as indicated at E, for the double purpose of forming a convenient grip for the Wrench by which the bolt is screwed into the pin-block H and also to form shoulders for engagement with the crown-cam head M of the turn-bolt L. The outer end of the turn-bolt L is made square and is riveted into the finger-knob N, as shown in Fig. 2. A washer W of some yielding material is used for facilitating the use of the crown-cam M in drawing the upper end of the bracket firmly against the coned head D of the screw-bolt, and thus prevent any looseness or tendency to rattle.

I claim- A pianoforte actionholding device comprising; a screw-bolt latted and having a shoulder as described; a crown-cam and means for turning said cam; a bracket adapted to engage with said screw-bolt and having attached the said means for operating said crown-cam; substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 30th day of November, A. D. 1903.

PETER KRUMSOHEID.

Witnesses:

FRANK Gr. PARKER, JOHN BUCKLER. 

